Experimental and numerical investigation on the effect of hydrogen addition and N2/CO2 dilution on laminar burning velocity of methane/oxygen mixtures

Jithin, E.V.; Varghese, Robin John; Velamati, Ratna Kishore

doi:10.1016/j.ijhydene.2020.04.105

Cited by 39 publications

(15 citation statements)

References 46 publications

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“…The investigation on the effect of concentration of methane in biogas when it is used as a fuel for a spark ignition engine was reported by Porpatham et al [34]. Other studies revealed the effect of additives (N 2 , Ar, H 2 O or CO 2 ) on CH 4 /air, CH 4 /CO 2 /air and CH 4 /O 2 /H 2 /inert flames [35][36][37][38][39][40][41]. The attention of other researchers has been directed towards the combustion characteristics of biogas under hydrogen-enriched conditions [24,[42][43][44][45][46][47][48][49].…”

Section: Introductionmentioning

confidence: 99%

Laminar Burning Velocity of Biogas-Containing Mixtures. A Literature Review

et al. 2021

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Currently, the use of fossil fuels is very high and existing nature reserves are rapidly depleted. Therefore, researchers are turning their attention to find renewable fuels that have a low impact on the environment, to replace these fossil fuels. Biogas is a low-cost alternative, sustainable, renewable fuel existing worldwide. It can be produced by decomposition of vegetation or waste products of human and animal biological activity. This process is performed by microorganisms (such as methanogens and sulfate-reducing bacteria) by anaerobic digestion. Biogas can serve as a basis for heat and electricity production used for domestic heating and cooking. It can be also used to feed internal combustion engines, gas turbines, fuel cells, or cogeneration systems. In this paper, a comprehensive literature study regarding the laminar burning velocity of biogas-containing mixtures is presented. This study aims to characterize the use of biogas as IC (internal combustion) engine fuel, and to develop efficient safety recommendations and to predict and reduce the risk of fires and accidental explosions caused by biogas.

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Section: Introductionmentioning

confidence: 99%

Laminar Burning Velocity of Biogas-Containing Mixtures. A Literature Review

et al. 2021

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“…The main cause of such effects is the higher reactivity of H 2 compared to each C 1 -C 4 alkanes from NG, resulting in important variations of ignition and propagation characteristic parameters of NG-air combustion: decreases in ignition delay times of selfignition and minimum ignition energies, increases in adiabatic flame temperature and in laminar burning velocity [9,11,20,21]. Taking into account the variable composition of NG as a result of current changes in its supplies, many studies were conducted on CH 4 /H 2 /air flames [8,11,13,14,[19][20][21][22][23][24][25][26][27][28][29][30][31][32]. Such studies revealed the effect of H 2 enrichment: enlargement of the flammability range of CH 4 -air mixtures [11,13,14], decreases in ignition delay times in jet-stirred reactors, rapid compression machines or shock tubes [21,26,30], decreases in maximum experimental safe gap (MESG) [11], and increases in flame speed and laminar burning velocity [8,[22][23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

“…Taking into account the variable composition of NG as a result of current changes in its supplies, many studies were conducted on CH 4 /H 2 /air flames [8,11,13,14,[19][20][21][22][23][24][25][26][27][28][29][30][31][32]. Such studies revealed the effect of H 2 enrichment: enlargement of the flammability range of CH 4 -air mixtures [11,13,14], decreases in ignition delay times in jet-stirred reactors, rapid compression machines or shock tubes [21,26,30], decreases in maximum experimental safe gap (MESG) [11], and increases in flame speed and laminar burning velocity [8,[22][23][24][25][26][27][28][29][30][31][32]. Another beneficial effect of enriching methane with hydrogen consists of the increase in flame resistance to strain-induced extinction, as highlighted by Di Sarli et al [33,34].…”

Section: Introductionmentioning

confidence: 99%

“…For the same hydrogen-enriched methane/air premixed flames, Di Sarli and Di Benedetto investigated the effects of non-equidiffusion on their unsteady propagation [34]. Numerical studies of flame ignition and propagation also outlined the increase in reactivity determined by H 2 addition and discussed the pathways of CH 4 -H 2 oxidation in air, as compared to CH 4 oxidation [3,7,18,19,26,30,32,35].…”

Section: Introductionmentioning

confidence: 99%

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Laminar Burning Velocities of Hydrogen-Blended Methane–Air and Natural Gas–Air Mixtures, Calculated from the Early Stage of p(t) Records in a Spherical Vessel

2021

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The flammable hydrogen-blended methane–air and natural gas–air mixtures raise specific safety and environmental issues in the industry and transportation; therefore, their explosion characteristics such as the explosion limits, explosion pressures, and rates of pressure rise have significant importance from a safety point of view. At the same time, the laminar burning velocities are the most useful parameters for practical applications and in basic studies for the validation of reaction mechanisms and modeling turbulent combustion. In the present study, an experimental and numerical study of the effect of hydrogen addition on the laminar burning velocity (LBV) of methane–air and natural gas–air mixtures was conducted, using mixtures with equivalence ratios within 0.90 and 1.30 and various hydrogen fractions rH within 0.0 and 0.5. The experiments were performed in a 14 L spherical vessel with central ignition at ambient initial conditions. The LBVs were calculated from p(t) data, determined in accordance with EN 15967, by using only the early stage of flame propagation. The results show that hydrogen addition determines an increase in LBV for all examined binary flammable mixtures. The LBV variation versus the fraction of added hydrogen, rH, follows a linear trend only at moderate hydrogen fractions. The further increase in rH results in a stronger variation in LBV, as shown by both experimental and computed LBVs. Hydrogen addition significantly changes the thermal diffusivity of flammable CH4–air or NG–air mixtures, the rate of heat release, and the concentration of active radical species in the flame front and contribute, thus, to LBV variation.

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“…The authors proposed an explicit correlation between the heat capacity of the diluent and the laminar burning velocity as a function of the heat capacity possessing a predominant effect on the laminar flame. Jithin et al [ 12 ] and Xie et al [ 13 ] also carried out a series of experimental and numerical studies on the effect of CO 2 dilution on the laminar burning velocity. Hu et al [ 14 ] conducted numerical studies on the effect of diluents on the laminar burning velocity of premixed methane/air/diluent flames.…”

Section: Introductionmentioning

confidence: 99%

The Effects of CO2 Additional on Flame Characteristics in the CH4/N2/O2 Counterflow Diffusion Flame

Chen

Zhang

2021

Molecules

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The effects (chemical, thermal, transport, and radiative) of CO2 added to the fuel side and oxidizer side on the flame temperature and the position of the flame front in a one-dimensional laminar counterflow diffusion flame of methane/N2/O2 were studied. Overall CO2 resulted in a decrease in flame temperature whether on the fuel side or on the oxidizer side, with the negative effect being more obvious on the latter side. The prominent effects of CO2 on the flame temperature were derived from its thermal properties on the fuel side and its radiative properties on the oxidizer side. The results also highlighted the differences in the four effects of CO2 on the position of the flame front on different sides. In addition, an analysis of OH and H radicals and the heat release rate of the main reactions illustrated how CO2 affects the flame temperature.

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Experimental and numerical investigation on the effect of hydrogen addition and N2/CO2 dilution on laminar burning velocity of methane/oxygen mixtures

Cited by 39 publications

References 46 publications

Laminar Burning Velocity of Biogas-Containing Mixtures. A Literature Review

Laminar Burning Velocity of Biogas-Containing Mixtures. A Literature Review

Laminar Burning Velocities of Hydrogen-Blended Methane–Air and Natural Gas–Air Mixtures, Calculated from the Early Stage of p(t) Records in a Spherical Vessel

The Effects of CO2 Additional on Flame Characteristics in the CH4/N2/O2 Counterflow Diffusion Flame

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